Film specifications#
- Manufacturer
- ORWO
- Film
- NK 18
- Speed
- 50
- Process
- ORWO 5160
- Formats
- 135, SL, 127, 120, 620, sheet film
- Base
- Triacetate
- Made in
- GDR
- Status
- Discontinued — replaced by ORWOCOLOR NC 16
Character & history#
General purpose unmasked color negative film balanced for artificial light (3200K). Remaining stock of Agfacolor Ultra.
Description adapted from Wikipedia’s “List of discontinued photographic films” (CC BY-SA 4.0).
Exposure guide at ISO 50#
Sunny 16 for this film: f/16 at 1/50 s in bright sun. Negative film tolerates 2–3 stops of overexposure; slide film needs accuracy within about ⅓–½ stop.
| Light | f/2 | f/4 | f/8 | f/16 |
|---|---|---|---|---|
| EV 16 · Snow / beach, bright sun | — | 1/2000 s | 1/500 s | 1/125 s |
| EV 15 · Bright sun | — | 1/1000 s | 1/250 s | 1/60 s |
| EV 14 · Hazy sun | 1/2000 s | 1/500 s | 1/125 s | 1/30 s |
| EV 13 · Cloudy-bright | 1/1000 s | 1/250 s | 1/60 s | 1/15 s |
| EV 12 · Overcast / open shade | 1/500 s | 1/125 s | 1/30 s | 1/8 s |
| EV 10 · Sunset | 1/125 s | 1/30 s | 1/8 s | 0.5 s |
| EV 8 · Bright interior | 1/30 s | 1/8 s | 0.5 s | 2 s |
| EV 5 · Home interior at night | 1/4 s | 1 s | 4 s | 15 s |
| EV 3 · City street at night | 1 s | 4 s | 15 s | > 1 min |
Push & pull options#
Tell your lab how many stops you pushed or pulled so development is adjusted for the whole roll.
| Adjustment | Rate the film at | Effect |
|---|---|---|
| Pull 1 stop | EI 25 | Lower contrast, finer grain |
| Push 1 stop | EI 100 | More contrast and grain |
| Push 2 stops | EI 200 | Strong contrast, coarse grain, blocked shadows |
| Push 3 stops | EI 400 | Strong contrast, coarse grain, blocked shadows |
Long exposures#
Most films suffer reciprocity failure beyond about 1 second: they need more exposure than the meter says. As a rule of thumb add ⅓–1 stop for 1–10 s and 1–2 stops beyond 10 s for older emulsions; modern T-grain films (and Fuji Acros) need much less. Check the manufacturer's datasheet.
Similar films#
Other color negative film around ISO 50.
- CineStill 50D ISO 50
- Lomography Redscale XR ISO 50
- Silberra Color 50 ISO 50
- Agfa Agfacolor Ultra 50 ISO 50 · disc.
- Fujifilm Fujicolor N ISO 50 · disc.
- Fujifilm Fujicolor N Professional Type L ISO 50 · disc.
- ORWO NT 18 ISO 50 · disc.
- ADOX NC 17 ISO 40 · disc.
- Agfa Agfacolor CN17 ISO 40 · disc.
- Agfa Agfacolor CN17M ISO 40 · disc.
- Agfa Agfacolor CN17S ISO 40 · disc.
- Agfa Negativfilm Ultra K ISO 40 · disc.
- Agfa Negativfilm Ultra T ISO 40 · disc.
- Ferrania Ferraniacolor N27 ISO 40 · disc.
- Foma Fomacolor N 17 / Fomacolor ND 17 ISO 40 · disc.
- Foma Fomacolor NU 17 ISO 40 · disc.
- Forte Fortecolor ISO 40 · disc.
- ORWO NC 17 Mask ISO 40 · disc.
More ORWO films#
Frequently asked questions#
What ISO is ORWO NK 18?
50 — set your meter to ISO 50 for box speed.
Is ORWO NK 18 still made?
No, it has been discontinued (1964–1966).
How do I develop ORWO NK 18?
ORWO 5160 process.
Is ORWO NK 18 available in 35mm?
Yes — formats: 135, SL, 127, 120, 620, sheet film.
Sources & licences#
- Wikipedia: List of discontinued photographic films — CC BY-SA 4.0
Last updated October 03, 2026 · How we calculate · Sources